Promethium(III) bromide
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| Promethium(III) bromide | |
|---|---|
| Other names | Promethium tribromide |
| Identifiers | |
| Standard InChI | InChI=1S/3BrH.Pm/h3*1H;/q;;;+3/p-3 |
| Standard InChIKey | GWRKFHUNEGTAQB-UHFFFAOYSA-K |
| CAS number | [] |
| Properties[1] | |
| Chemical formula | PmBr3 |
| Molar mass | 386.63 g mol−1 [note 1] |
| Appearance | coral-red solid |
| Melting point |
624 °C |
| Structure[1][2] | |
| Crystal structure | Plutonium tribromide |
| Coordination geometry | bicapped trigonal prismatic (Pm3+) |
| Thermochemistry[3] | |
| Std enthalpy of formation ΔfH |
−864 kJ mol−1 est. |
| Related compounds | |
| Other anions | Promethium(III) fluoride Promethium(III) chloride Promethium(III) iodide |
| Other cations | Praseodymium(III) bromide Neodymium(III) bromide Samarium(III) bromide Europium(III) bromide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Promethium(III) bromide, PmBr3, is the only known bromide of promethium. It is prepared (on a 100-µg scale) by reacting gaseous hydrogen bromide with promethium(III) oxide at 500 °C, and has the plutonium tribromide structure with eight-coordinate promethium, isostructural with NdBr3 and SmBr3.[1] The solid reacts with water vapour on heating to form promethium oxobromide, PmOBr.[3]
Notes and references
Notes
- ↑ The molar mass is based on promethium-147 (t½ = 2.6234(2) a; Ar = 146.915 1385(26)), the most commonly encountered isotope of promethium.
References
- ↑ 1.0 1.1 1.2 Cotton, Simon Lanthanide and Actinide Chemistry, 2nd ed.; Wiley: New York, 2006; pp 115–17. ISBN 0470010061.
- ↑ Wilmarth, W. R.; Haire, R. G.; Young, J. P.; Ramey, D. W.; Peterson, J. R. Absorption spectrophotometric and X-ray diffraction studies of the trihalides of promethium in the solid state. J. Less Common Met. 1988, 141 (2), 275–84. DOI: 10.1016/0022-5088(88)90413-4.
- ↑ 3.0 3.1 Wishnevsky, V.; Theissig, W.; Weigel, F. The vapor phase hydrolysis of lanthanide(III) bromides IV: Heat and free energy of the reaction PmBr3(s) + H2O(g) ⇌ PmOBr(s) + 2 HBr(g). J. Less Common Met. 1984, 99 (2). DOI: 10.1016/0022-5088(84)90230-3.
Further reading
- Wilmarth, W. R.; Begun, G. M.; Haire, R. G.; Peterson, J. R. Raman spectra of Pm2O3, PmF3, PmCl3, PmBr3 and PmI3. J. Raman Spectrosc. 1988, 19 (4), 271–75. DOI: 10.1002/jrs.1250190410.
External links
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